Backbencher (noun)

1. A member of parliament or congress who does not hold a formal position of power or leadership within their party and sits in the back rows of the assembly.
2. A less prominent or influential member of a group or organization.

Origin:

From the back benches in the british parliament where less prominent members of a political party sit .

Examples:

1. The backbencher was not invited to the meeting with the prime minister.
2. The leader of the party had little support from the backbenchers.
3. The backbencher had a strong interest in education reform.
4. Backbenchers have a lower profile than frontbenchers.
5. Backbencher MPs often have more freedom to speak their minds.